0

I am using Potree/three.js web viewer for visualisation of 3D cloud points. I would like to compute the volume inside the user defined polygon. Potree supports only drawing a cube in measure tool. However Potree supports area measurement by irregular polyon but not volume.

How do I compute the volume using the user defined polygon?

0

I found an approach to calculate volume on Potree. after drawing a polygone area around the wanted element we can calculate the volume partially using a triangulation (in my case i used Delaunay triangulation using the js library "Delaunator"

const points = [[168, 180], [168, 178], [168, 179], [168, 181], [168, 183], ...];

const delaunay = Delaunator.from(points);
console.log(delaunay.triangles);
// [623, 636, 619,  636, 444, 619, ...]

now after we have small triangles of the drawed polygone we are going to calculate partial volumes of pointcloud inside each triangle. to do that i calculated the coordinates of the center of each triangle and then get the Z value of the intersection with cloud point.

now that we have the are of each triangle and the z valu we can calculate parial volumes Vi = (triangleArea*height)/3

the total volume is the sum of partial volumes

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.